Antiperspirant-deodorant cosmetic stick products

ABSTRACT

This invention provides an improved antiperspirant-deodorant cosmetic stick product. An essential aspect of the cosmetic stick product is a content of particulate antiperspirant and alkali metal bicarbonate ingredients, at least one of which has ingredient particle surfaces coated with a hydrophilic organic polymer.

This application is a division of application Ser. No. 07/986,916, filedDec. 8, 1992, now abandoned.

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS

The subject matter of the present invention is related to that describedin patent application Ser. No. 07/986,917, filed Dec. 8, 1992 now U.S.Pat. No. 5,378,452; and patent application Ser. No. 07/986,810, filedDec. 08, 1992.

BACKGROUND OF THE INVENTION

Antiperspirants combat axillary odors by inhibiting perspiration throughthe action of astringent salts such as aluminum and zinc salts, but maybe irritating to a large number of users. Deodorants function byneutralizing the objectionable odors resulting from the degradation ofseveral components of perspiration by chemical and microbial action intomalodorous fatty acids.

Numerous solid antiperspirant and/or deodorant compositions have beendescribed in the chemical and cosmetic literature. These compositionsgenerally are emulsion sticks or suspensoid sticks. Emulsion stickscontain a solution of the antiperspirant ingredient incorporated intothe stick via an emulsion. Although emulsion sticks are desirable incertain respects, they tend to be unstable, exhibit tackiness, and leavea visible residue on the skin after use. Suspensoid sticks contain thepowdered antiperspirant ingredient suspended in the stick without theuse of water or an emulsion. While suspensoids have stability, they tendto leave a white chalky residue on the skin after application.

Manufacturers have found that anhydrous antiperspirant stick systems aremore marketable and have good consumer acceptance primarily due to theease of application to the skin, good cosmetic esthetics and anacceptable degree of effectiveness. Previous to the development ofanhydrous stick systems, numerous water based systems were developed inwhich the active astringent salts were solubilized in a thickened orgelled composition. This is exemplified in U.S. Pat. Nos. 2,732,327;2,857,315; 3,255,082; and 3,928,557. The water based systems aredifficult to apply to the skin, and their consistency and effectivenessare variable.

Many anhydrous stick compositions have been described in the literaturewhich attempt to improve the delivery and the effectiveness of theirantiperspirant and deodorant characteristics. Antiperspirant sticksystems consisting of low molecular weight monohydric alcohols inconjunction with polyhydric alcohols are described in U.S. Pat. No.4,137,306. These sticks have the advantage of quicker drying rates, butthe residue of the polyhydric alcohols in combination with theastringent salts produces a high degree of tack, and their effectivenessis limited to the type and amount of astringent salts that could beincorporated in the stick matrix.

Anhydrous stick compositions that suspend the aluminum salt in ahydrophobic matrix are described in U.S. Pat. No. 4,049,792. Thesecompositions employ waxy materials and long chain fatty esters to form astick that delivers the active astringent salts to the skin.

Cosmetic stick compositions made in accordance with these embodimentsare greasy, and the active astringent salt is enveloped in a manner thatprevents maximum performance. To alleviate this inherent negativecharacteristic, volatile silicone fluids replacement of the lessvolatile long chain fatty esters is described in U.S. Pat. No.4,126,679. This disclosure teaches the advantage of utilizing a volatilenon-staining liquid such as cyclic dimethylpolysiloxanes (referred to asvolatile silicones), in combination with various types of waxes, as acarrier for the active astringent salts in an antiperspirant stickcomposition. Similar antiperspirant stick compositions containingvolatile silicones are described in U.S. Pat. Nos. 4,511,554; 4,980,156;and 4,985,238.

With respect to deodorant activity, sodium bicarbonate has long beenrecognized for its deodorant properties, and has commonly been used as ahousehold deodorant. Plain powdered sodium bicarbonate, or sodiumbicarbonate diluted with talc or other filler, has been used as anunderarm deodorant as disclosed in U.S. Pat. No. 4,382,079. Otherpublications which describe cosmetic stick compositions containing abicarbonate deodorant include U.S. Pat. Nos. 4,822,602 and 4,832,945.

However, the development of a practical and effective antiperspirantcomposition in cosmetic stick form which is also capable ofdeodorization, and which is capable of consumer acceptability, presentsmany factors which are unique. Because sodium and potassium bicarbonatehave only limited solubility in water, alcohol and other solvents, thepreparation of a composition suitable for dispensing in cosmetic stickform has involved many processing obstacles. In addition to the problemof limited solubility, sodium bicarbonate is incompatible with theactive astringent salts and with other ingredients of conventional stickcompositions. Also, the dimensional stability of the cosmetic stickcontaining sodium bicarbonate, and the esthetic appearance and the"feel" on the skin, are just a few of the additional difficultiesencountered in the preparation of a low residue antiperspirant-deodorantcosmetic stick product.

Another problem associated with the incorporation of a bicarbonatedeodorant ingredient in an antiperspirant formulation is the tendencyfor the high density bicarbonate salt particles to settle in the fluidmedium during processing. Also, under the elevated temperatureconditions required for the admixing and blending of ingredients,bicarbonate degradation and evolution of carbon dioxide and water occur.

There is continuing interest in the development of antiperspirantcosmetic stick products which exhibit deodorizing activity, and inimproved processes for their preparation.

Accordingly, it is an object of this invention to provide a process forthe manufacture of an antiperspirant-deodorant cosmetic stick productwhich contains a bicarbonate deodorant ingredient, and which ischaracterized by excellent esthetics and cosmetic properties.

It is another object of this invention to provide a homogeneousantiperspirant cosmetic stick product containing a bicarbonate deodorantingredient which is a particulate solid having particles with an organicpolymeric coating that lowers the relative density of the particles.

Other objects and advantages of the present invention shall becomeapparent from the accompanying description and examples.

DESCRIPTION OF THE INVENTION

One or more objects of the present invention are accomplished by theprovision of a process for preparing an antiperspirant-deodorantcosmetic stick product which comprises (1) heating between about 10-50parts by weight of a volatile silicone oil ingredient to a temperatureof about 120°-220° F.; (2) adding to the heated silicone oil ingredientbetween about 1-30 parts by weight of a liquid emollient ingredient,between about 12-24 parts by weight of a low melting point waxingredient, and between about 0.5-5 parts by weight of a surfactantingredient to form a homogeneous fluid medium; (3) adding between about18-30 parts by weight of an antiperspirant ingredient to the heatedfluid medium; (4) adding between about 0.05-30 parts by weight of aparticulate alkali metal bicarbonate deodorant ingredient to form ahomogeneous fluid suspension medium, wherein the surfaces of the addedalkali metal bicarbonate particles are pre-coated with a hydrophilicorganic polymer; and (6) dispensing the heated fluid suspension mediuminto cosmetic stick containers, and cooling the container contents toform solid sticks at room temperature.

In another process embodiment, particulate antiperspirant ingredient hasparticles pre-coated with a hydrophilic polymer to prevent interactionwith basic ingredients and to minimize settling during processing or inthe final cosmetic stick product. Optionally, both the particulateantiperspirant and alkali metal bicarbonate ingredients can bepre-coated with a hydrophilic polymer, which functions to protect theingredient particles and to minimize settling because the density of theparticles is decreased by the organic coating content.

An invention antiperspirant-deodorant cosmetic stick product typicallycontains the following weight proportions of main ingredients:

    ______________________________________                                        Ingredient        Weight                                                      ______________________________________                                        volatile silicone oil                                                                           25-50                                                       liquid emollient   2-20                                                       wax (MP 95°-180° F.)                                                              15-20                                                       antiperspirant    20-28                                                       bicarbonate deodorant                                                                           0.1-25                                                      surfactant        1-3                                                         ______________________________________                                    

The volatile silicone oil ingredient in an antiperspirant-deodorantcosmetic stick product of the present invention preferably is a cyclicor linear polydimethylsiloxane containing between about 3-9 siliconatoms. A suitable cyclic volatile polydimethylsiloxane compound isillustrated by the formula: ##STR1## where n is an integer with a valueof about 3-7.

A suitable linear polydimethylsiloxane is illustrated by the formula:

    (CH.sub.3).sub.3 Si--O[Si(CH.sub.3).sub.2 --O].sub.n --Si(CH.sub.3).sub.3

where n is an integer with a value of about 1-7.

Linear volatile silicone compounds generally have viscosities of lessthan about 5 centistokes at 25° C. while the cyclic type compounds haveviscosities of less than about 10 centistokes.

Typical of the volatile silicone compounds that can be employed forpurposes of the present invention is cyclomethicone, which is a cyclicdimethylpolysiloxane conforming to the above formula where n averagesbetween 3-6. Dow Corning 245 Fluid (Dow Corning) is a cyclic volatilesilicone which is commercially available. CTFA Cosmetic IngredientDictionary, Third Edition, (Estrin et al., Editors; The Cosmetic,Toiletry and Fragrance Association, Inc.; 1982) lists cyclic siliconeson page 60, under the entry "Cyclomethicone".

The liquid emollient ingredient of an invention cosmetic stick productis selected from one or more water-insoluble organic compounds which areliquid at 25° C. and which contribute a combination of properties thatare advantageous in an invention antiperspirant-deodorant cosmetic stickproduct.

The term "water-insoluble" as employed herein refers to an emollientingredient which has a water-solubility of less than about one gram per100 grams of water at 25° C.

A present invention emollient ingredient exhibits a low degree ofirritation and toxicity in topical applications, and provides asoftening or soothing effect on surface skin tissue.

Preferred water-insoluble liquid emollients include fatty acids such asoleic and ricinoleic; fatty alcohols such as oleyl, lauryl andhexadecyl; esters such as diisopropyl adipate, benzoic acid esters of C₉-C₁₅ alcohols, and isononyl isononanoate; alkanes such as mineral oil;silicones such as dimethylpolysiloxane and cyclic dimethyl-polysiloxane;and ethers such as polyoxypropylene butyl ether and polyoxypropylenecetyl ether. Preferred water-insoluble liquid emollients includediisopropyl adipate, 2-ethylhexyl palmitate, dimethylpolysiloxane (50cst.), and polyoxypropylene (14) butyl ether.

The low melting point wax ingredient of a present invention cosmeticstick product comprises one or more organic compounds which have amelting point in the range between about 95°-180° F.

Suitable types of wax-like compounds include fatty acids, fattyalcohols, fatty acid esters, fatty acid amides, and the like, which havean aliphatic chain length between about 8-30 carbon atoms. Illustrativeof wax-like compounds are cetyl alcohol, palmitic acid, myristylalcohol, stearyl alcohol, paraffin, and the like, and mixtures thereof.

The low melting point wax ingredient can include up to about 30 weightpercent, based on the weight of wax ingredient, of a wax which has amelting point between about 180°-220° F. Illustrative of these highermelting waxes are beeswax, spermaceti, carnauba, bayberry, candelilla,,montan, ozokerite, ceresin, paraffin, castor wax, Fischer-Tropsch waxes,and the like.

The antiperspirant ingredient of a present invention cosmetic stickproduct typically is a particulate astringent compound which has anaverage particle size between about 1-100 microns. Superior cosmeticstick properties are obtained if part or all of the antiperspirantingredient is in the form of particles which have a diameter less thanabout one micron.

Suitable astringent compounds include aluminum chloride, aluminumchlorohydrate, aluminum sulfocarbolate, aluminum sulfate,aluminum-zirconium chlorohydrate, zinc sulfate, zinc sulfocarbolate, andzirconium chlorohydrate. Preferred types of astringent compounds arealuminum chlorohydrates and aluminum-zirconium chlorohydrates, such asaluminum zirconium tetrachlorohydrex glycine which is commerciallyavailable as Rezal 36 GP Superultrafine (Reheis), and Reach AZP 908(Reheis).

The bicarbonate deodorant ingredient of an invention cosmetic stickproduct is selected from alkali metal and ammonium bicarbonates, such assodium bicarbonate, potassium bicarbonate and ammonium bicarbonate, andmixtures thereof. The bicarbonate deodorant ingredient can contain up toabout 30 weight percent, based on the weight of deodorant ingredient, ofan alkali metal or ammonium carbonate compound.

The average particle size of the bicarbonate deodorant ingredient can bein the range between about 1-100 microns. In formulations in which thebicarbonate deodorant ingredient particles are not surface-coated,improved cosmetic stick properties are obtained if part or all of thebicarbonate ingredient has a particle size diameter less than about onemicron. Colloidal size particles facilitate incorporation into thecosmetic stick matrix, and the resultant stick composition has asmoother non-gritty feel when applied to the skin.

If the particulate bicarbonate deodorant ingredient is surface-coatedwith a hydrophilic polymer, the average size of the core bicarbonateparticles typically is in the range between about 5-80 microns.

The surfactant ingredient of an invention cosmetic stick product isselected from nonionic, cationic and anionic polymers.

Suitable surfactant polymers include cetyltrimethylammonium bromide;sodium lauryl sulfate; sodium dodecylbenzenesulfonate; ammoniumlignosulfonate; condensation products of ethylene oxide with fattyalcohols, amines or alkylphenols; partial esters of fatty acids andhexitol anhydrides; polyalkylene glycol esters; and the like.Illustrative of a preferred type of surfactant polymer is polyethyleneglycol (PEG) stearate, which is commercially available as PEG 600distearate.

Optional ingredients also may be included in an invention cosmetic stickformulation, such as bacteriostats, fungistats, fillers, stabilizingagents, antioxidants, pigments, coloring agents, perfumes, hardeners,chelating agents, and the like.

A bacteriostat such as 2,4,4'-trichloro2'-hydroxydiphenyl ether(Triclosan) typically is added in a quantity between about 0.08-3 weightpercent, based on the weight of the cosmetic stick product.

An optional ingredient such as colloidal silica suspending agent isadded in a quantity between about 1-3 weight percent, based on theweight of the cosmetic stick product.

An important aspect of the present invention is the utilization ofpre-coated particles of alkali metal bicarbonate ingredient and/orantiperspirant ingredient in the manufacture of theantiperspirant-deodorant cosmetic stick product. The polymeric coatingon one or both of the particulate antiperspirant and bicarbonateingredient solid phases minimizes any reaction between the acidic andbasic compounds, and prevents loss of antiperspirant-deodorantactivities.

Pre-coating of ingredient particles also has the beneficial effect ofimproving the suspension properties of the particles in the fluidformulation admixture during processing. Less inorganic particlesettling occurs because the density of the coated particles and thefluid formulation organic phase density are more closely matched than isthe case with uncoated inorganic particles.

The application of the coating to the core matrix particles isaccomplished by conventional means such as pan coating, fluidizedcoating, centrifugal fluidized coating, and the like. The coatingpolymer usually is dissolved in a suitable solvent such as water,methanol, ethanol, acetone, tetrahydrofuran, ethyl acetate,dimethylformamide, and the like, as appropriate for a selected polymerspecies. A coating polymer also can be applied in the form of anemulsion or suspension. After the coating medium is applied to theparticles, the solvent medium is removed by evaporation, thereby forminga continuous film coating which encapsulates the individual particles.

The coating thickness on the particle surfaces typically will vary inthe range between about 0.1-20 microns. The coating can consist of asingle layer or multiple layers. The polymeric coating can constitutebetween about 5-30 weight percent of the total dry weight of the coatedparticles.

The hydrophilic polymer employed for coating the ingredient particles isselected from water-soluble and water-dispersible organic polymers. Amixture of polymers can be employed, and a content of between about0.5-40 weight percent of a water-insoluble polymer, based on the coatingweight, can be included.

The term "hydrophilic" as employed herein refers to an organic polymerwhich has a water-solubility of at least about one gram per 100 grams ofwater at 25° C.

Suitable hydrophilic polymers for coating particles include gum arabic,gum karaya, gum tragacanth, guar gum, locust bean gum, xanthan gum,carrageenan, alginate salt, casein, dextran, pectin, agar, sorbitol,2-hydroxyethyl starch, 2-aminoethyl starch, maltodextrin, polydextrose,2-hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulosesalt, cellulose sulfate salt, polyvinylpyrrolidone, polyethylene glycol,polypropylene glycol, polyethylene oxide, polyvinyl alcohol/acetate,polyacrylamide, and the like. Polyvinyl acetate is illustrative of awater-insoluble polymer which can be included as an additional coatingcomponent to moderate the hydrophilicity of the coating.

The rate of particle matrix compound release from the particle coreunder moisture conditions can be controlled by the quantity and type ofhydrophilic polymer coating on the particle surfaces.

Low molecular weight hydrophilic polymers will release the particlematrix compound at a relatively fast rate in the presence of moisture.High molecular weight polymers which are less hydrophilic will releaseat a relatively slow rate. Additional rate control is obtained byemploying mixtures of polymer components of varied hydrophilicity.

Polyethylene glycol (M.W. of 4000) or polyvinyl alcohol will releaseparticle matrix compound at a relatively fast rate. Polyethylene oxide(M.W. of 4,000,000) or partially hydrolyzed polyvinyl acetate willrelease at a relatively slow rate. Polyvinylpyrrolidone will releaseparticle matrix compound at an immediate rate when in contact withunderarm type of moisture.

In general, the ingredients of the formulation can be blended in anyorder. However, as described hereinabove, in the practice of theinvention process there is advantage in utilizing a phased order ofingredient addition and blending under controlled temperatureconditions. Additional advantage is obtained in the invention process ifthere is a short time lapse between the alkali metal bicarbonatedeodorant ingredient addition step and the cosmetic stick containerfilling and solidifying step. Alkali metal bicarbonate can convert toalkali metal carbonate, carbon dioxide and water at elevatedtemperatures.

Adding the bicarbonate deodorant as the last ingredient of the blendedformulation, and processing the formulation to the solid cosmetic stickformation stage within a short time period, are factors which minimizethe degradation of the bicarbonate ingredient, and the undesirableformation of water and carbon dioxide vapor byproducts. The addition andmixing of the bicarbonate deodorant ingredient into the formulation, andthe dispensing of the formulation into cosmetic stick containers, can beaccomplished as an essentially instantaneous procedure by utilizing anintegrated mixing valve nozzle device, such as the type described inU.S. Pat. Nos. 2,816,518; 3,454,198; 3,949,904; 4,318,429; 4,549,813;5,046,538; 5,094,276; and the like.

The practice of the invention process for the production of a cosmeticstick product can be conducted in conventional equipment, and is readilyadaptable to a commercial-scale manufacturing operation.

A present invention cosmetic stick product preferably has a hardnesspenetration value between about 4-12 millimeters, as determined byAmerican Society For Testing Materials (ASTM) Method D5.

A present invention antiperspirant-deodorant cosmetic stick product hasexceptional properties for treating or preventing perspiration andmalodor associated with human underarm perspiration. A present inventioncosmetic stick product can be applied effectively with safety andcomfort for reduction of underarm perspiration and offensive odors.

Because of the incorporation of the alkali metal bicarbonate deodorantingredient and/or the antiperspirant ingredient in the form ofpolymer-coated particles, an invention cosmetic stick product hasimproved dimensional stability, and better esthetic appearance and"feel" when applied to human skin.

The following Examples are further illustrative of the presentinvention. The components and specific ingredients are presented asbeing typical and various modifications can be derived in view of theforegoing disclosure within the scope of the invention.

EXAMPLE I

This Example illustrates a procedure for coating a particulatebicarbonate deodorant compound with a water-soluble organic polymer inaccordance with the present invention.

Guar gum (15 g, Supercol, Aqualon Co.) is dissolved in 150 ml of 50%aqueous ethanol solvent. Sodium bicarbonate (100 g, 50-80 microns,Church & Dwight) is suspended in the solution medium with stirring.

The solvent medium is removed by evaporation under vacuum. A dryfree-flowing powder is obtained. The particles are coated with a guarfilm having an average thickness of 2-5 microns.

EXAMPLE II

This Example illustrates a fluidized bed procedure for coating anantiperspirant compound with a water-soluble polymer in accordance withthe present invention.

A fluidized bed vessel is utilized which is equipped with a Wursterair-suspension coater system (WARF) as described in U.S. Pat. Nos.4,568,559 and 4,877,621.

A coating solution is prepared by dissolving polyethylene glycol (45 g,Poly-G 2000, Olin Corp.), and propylene glycol butyl ether (10 g, PPG14, Americol) in ethanol (600 g).

Particulate aluminum zirconium tetrachlorohydrex glycine (600 g, 60-100microns, Reheis) is charged into the coating chamber.

Compressed air is introduced into the coating chamber, and the polymericcoating solution is sprayed on the air-suspended antiperspirant corematrix particles, until the coating weight is about 20% of the total dryweight of the coated particles.

The procedure is repeated, except that Hydroxypropylmethylcellulose(Methocel 60 HG, Dow Chemical Co.) is employed as the water-solublepolymer.

EXAMPLE III

This example illustrates a pilot-plant procedure for the preparation ofan antiperspirant-deodorant cosmetic stick product in accordance withthe present invention.

A stainless steel tank is provided which is equipped with turbineagitation.

Silicone oil DC 245 (600 lbs, Dow Corning) is charged to the mixingtank. Agitation (55-65 RPM) is initiated, and heating the liquid mediumto 176° F. is commenced.

During the heating period, the following order of ingredients are addedto the stirred liquid medium:

    ______________________________________                                                           lbs.                                                       ______________________________________                                        diisopropyl adipate  60                                                       PPG 14 butyl ether (Americol)                                                                      40                                                       stearyl alcohol      340                                                      castor wax (MP-70)   60                                                       eicosanol            10                                                       PEG 600 distearate (Mazer)                                                                         40                                                       ______________________________________                                    

The mixture is stirred at 176° F. for about 30 minutes until theingredients are melted and the liquid medium is homogeneous. Thestirring speed is reduced to about 35 RPM, then Cab-o-sil M-5 (15 lbs,Cabot) and aluminum zirconium tetrachlorohydrex glycine (480 lbs,Reheis) are added. The temperature is maintained at 176° F. for about 40minutes until the fluid medium is uniform, and then the temperature islowered to 124° F.

Polymer-coated sodium bicarbonate 3 DF (140 lbs, Church & Dwight) and afragrance (6 lbs, 1FF 567-AT) respectively are added with stirring toSilicone oil DC 245 (245 lbs, Dow Corning) in a second mixing tank at atemperature of 124° F. to form a homogeneous suspension medium. Thesodium bicarbonate particles are pre-coated with guar gum as describedin Example I.

The contents of the two mixing tanks which contain heated fluid mediumare transferred to separate fill tanks through a Greer mill, and thefill tanks are connected to a mixing and dispensing nozzle device, ofthe type described in U.S. Pat. No. 5,094,276. The nozzle device isadapted for homogeneously blending the two separate streams of fluidmedia, and dispensing a predetermined quantity of the blended fluid.

Plastek 2 oz. bottom-fill stick containers are filled with the blendedfluid. The container contents are cooled to a room temperature solidstick over a period of about 45 minutes. The average hardness value ofthe solid sticks is 7 (ASTM Method D5).

What is claimed is:
 1. An antiperspirant-deodorant cosmetic stickproduct comprising the following weight percent of ingredients:

    ______________________________________                                        volatile silicone oil                                                                            25-50                                                      liquid emollient   2-20                                                       low melting point wax                                                                            15-20                                                      antiperspirant     20-28                                                      particulate alkali metal                                                                         0.1-25                                                     bicarbonate deodorant                                                         surfactant         1-3                                                        ______________________________________                                    

wherein the particulate alkali metal bicarbonate deodorant ingredienthas an average particle size between about 1-100 microns, and thesurfaces of the particles are coated with a hydrophilic polymericcoating having a thickness in the range between about 0.1-20 microns. 2.A cosmetic stick product in accordance with claim 1 wherein theantiperspirant ingredient is selected the group consisting of astringentaluminum compounds, astringent zirconium compounds, complexes ofzirconium compounds, complexes of aluminum and mixtures thereof.
 3. Acosmetic stick product in accordance with claim 1 wherein theantiperspirant ingredient is an aluminum-zirconium tetrachlorohydratecompound.
 4. A cosmetic stick product in accordance with claim 1 whereinthe deodorant ingredient is sodium or potassium bicarbonate or a mixturethereof.
 5. A cosmetic stick product in accordance with claim 1 whereinthe polymer coating on the deodorant particles includes awater-insoluble polymer component.
 6. An antiperspirant-deodorantcosmetic stick product comprising the following weight percent ofingredients:

    ______________________________________                                        volatile silicone oil                                                                            25-50                                                      liquid emollient    2-20                                                      low melting point wax                                                                            15-20                                                      particulate antiperspirant                                                                       20-28                                                      particulate alkali metal                                                                         0.1-25                                                     bicarbonate deodorant                                                         surfactant         1-3                                                        ______________________________________                                    

wherein the particulate antiperspirant ingredient has an averageparticle size between about 1-100 microns, and the surfaces of theparticles are coated with a hydrophilic polymeric coating having athickness in the range between about 0.1-20 microns.
 7. A cosmetic stickproduct in accordance with claim 6 wherein the antiperspirant ingredientis selected from astringent aluminum and zirconium compounds, andcomplexes or mixtures thereof.
 8. A cosmetic stick product in accordancewith claim 6 wherein the antiperspirant ingredient is analuminum-zirconium tetrachlorohydrate compound.
 9. A cosmetic stickproduct in accordance with claim 6 wherein the deodorant ingredient issodium or potassium bicarbonate or a mixture thereof.
 10. A cosmeticstick product in accordance with claim 6 wherein the polymer coating onthe antiperspirant particles includes a water-insoluble polymercomponent.
 11. An antiperspirant-deodorant cosmetic stick productcomprising the following weight percent of ingredients:

    ______________________________________                                        volatile silicone oil                                                                            25-50                                                      liquid emollient    2-20                                                      low melting point wax                                                                            15-20                                                      particulate antiperspirant                                                                       20-28                                                      particulate alkali metal                                                                         0.1-25                                                     bicarbonate deodorant                                                         surfactant         1-3                                                        ______________________________________                                    

wherein the particulate antiperspirant and alkali metal bicarbonateingredients have an average particle size between about 1-100 microns,and the surfaces of the particles are coated with a hydrophilicpolymeric coating having a thickness in the range between about 0.1-20microns.
 12. A cosmetic stick product in accordance with claim 11wherein the antiperspirant ingredient is selected from the groupconsisting of astringent aluminum compounds, astringent zirconiumcompounds, complexes of zirconium compounds, complexes of aluminum andmixtures thereof.
 13. A cosmetic stick product in accordance with claim11 wherein the antiperspirant ingredient is an aluminum-zirconiumtetrachlorohydrate compound.
 14. A cosmetic stick product in accordancewith claim 11 wherein the deodorant ingredient is sodium or potassiumbicarbonate or a mixture thereof.
 15. A cosmetic stick product inaccordance with claim 11 wherein the polymer coating on theantiperspirant and deodorant particles includes a water-insolublepolymer component.